TRANSACTIONS OF WAGNER 

 1080 



TERTIARY FAUNA OF FLORIDA 



the posterior area more prominent and less fugacious, and with the lateral 

 teeth entirely obsolete. An examination of a recent specimen shows marked 

 anatomical differences also. 



The species of typical Cardiitni in our Tertiaries are few and do not sur- 

 vive the Oligocene. C. hatchetigbeense Aldrich, 1886, from the Lower Clai- 

 bornian and C. Tuonieyi Aldrich, 1886, from the Chickasawan are the only 

 well-established species in the literature. Gabb described a C. multiradiatum 

 (i860, not C. multiradiatum Sowerby, 1846) which Whitfield identifies with 

 a fossil from the Raritan clays of New Jersey, which is a Cardium s. s., but 

 its name must be changed, as it has been used in the genus before. C. vicks- 

 burgense Conrad, from the Vicksburgian, may belong to this section or to 

 Cerastoderma, I have not examined it. The " Cardium" aleuticum of Girard, 

 1850, from the Alaskan Eocene, is perhaps an internal cast of a Glycymeris. 

 " C." subtentum Conrad, 1849, from Oregon, appears to be a Venericardia. 

 Cardium. globosum Conrad (1848, printed glebosum by a typographical error 

 afterwards corrected by Conrad, but not Cardium globosum Bean, 1839, from 

 the Cornbrash of Scarborough, England; nor C. globosum d'Orbigny, 1849), 

 from the Jacksonian and Red Bluff beds, is perhaps to be placed in this 

 section, though its A-shaped spines recall Trachycardium. As glebosum is 

 a Latin word, it may best be retained as the name of the species, though in 

 no wise appropriate to the shell in question. 



Cardium propeciliare n. sp. 

 Plate 48, Figure 12. 



Oligocene marl of the Chipola River, Calhoun County, Florida ; Burns. 



Shell small, thin, inflated, slightly oblique and inequilateral, with high, 

 well-rounded beaks, anterior end slightly shorter, general outline suborbicular ; 

 sculptured with nineteen elevated ribs of triangular section separated by 

 narrow, cross-striated channelled interspaces, each rib surmounted by a low 

 keel the edge of which is periodically produced into short spines each ending 

 in a knob, sides of the ribs finely concentrically striate; near the posterior 

 end the whole surface shows a microscopic granulation; internal margins 

 deeply fluted; hinge normal, delicate. Alt. 20, Ion. 20, diam. 15.5 mm. 



This elegant little shell is close to the young of the C. echinatum L. of 

 Europe, in which, however, the ribs are lower, the interspaces wider and less 

 sharply cross-striated, the keel less elevated and continuous, and the spmes 

 long and sharp. The European shell is more equilateral, with a longer hinge- 



